Hot Water BoilerAutomatic oil or gas fired boilers series WNS have two types. One is steam boiler, and the other is hot water boiler. The capacity of steam boiler is1~10t/h, working pressure is 0.7~1.6MPa. Output of the hot water boiler is 0.7~7MW, water service temperature is 95degree or 115degree, water returnTemperature is 70degree. This series of boilers are adopted the structure of horizontal, internal-combustion, three-pass and full wet back. The combus-Tion chamber consists of corrugated internal furnace and wet smoke box. The fuel oil is atomized and injected from the burner into the combustionChamber where it's burnt into smoke of high temperature. The smoke enters the second pass threaded smoke tubes after the radiation and theConvection heat transfer occurred in the furnace and the smoke box, then it's back to the third pass smoke tubes, and proceeds with the convec-Tion heat transfer again. At last it passes the rear smoke box and is dispelled via the chimney.